//
//  TIASound.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 03/12/2016.
//  Copyright 2016 Thomas Harte. All rights reserved.
//

#pragma once

#include "Outputs/Speaker/Implementation/BufferSource.hpp"
#include "Concurrency/AsyncTaskQueue.hpp"

namespace Atari2600 {

// This should be a divisor of 38; audio counters are updated every 38 cycles, though lesser dividers
// will give greater resolution to changes in audio state. 1, 2 and 19 are the only divisors of 38.
constexpr int CPUTicksPerAudioTick = 2;

class TIASound: public Outputs::Speaker::BufferSource<TIASound, false> {
public:
	TIASound(Concurrency::AsyncTaskQueue<false> &);

	void set_volume(int channel, uint8_t volume);
	void set_divider(int channel, uint8_t divider);
	void set_control(int channel, uint8_t control);

	// To satisfy ::SampleSource.
	template <Outputs::Speaker::Action action> void apply_samples(std::size_t, Outputs::Speaker::MonoSample *);
	void set_sample_volume_range(std::int16_t);

private:
	Concurrency::AsyncTaskQueue<false> &audio_queue_;

	uint8_t volume_[2];
	uint8_t divider_[2];
	uint8_t control_[2];

	int poly4_counter_[2]{0x00f, 0x00f};
	int poly5_counter_[2]{0x01f, 0x01f};
	int poly9_counter_[2]{0x1ff, 0x1ff};
	int output_state_[2];

	int divider_counter_[2];
	int16_t per_channel_volume_ = 0;
};

}
